[Meta-analysis of Soil Organic Carbon and Its Active Fractions in Response to Straw and Film Mulching].

Abstract

In order to study the differences in the effects of mulching measures on soil organic carbon （SOC） and carbon fractions under different environments and farmland management measures, the Meta-quantitative analysis method was used to analyze the changes in SOC and carbon fractions under straw and film mulching, and the environmental and farmland management measures at the test sites were grouped to explore their change characteristics under different environments. Compared with film mulching, straw mulching was more beneficial to increase SOC, dissolved organic carbon （DOC）, and microbial biomass carbon （MBC） contents. The SOC percentage change rate under straw mulching was 14.93% higher than that under film mulching when the mean annual temperature was higher than 10℃, and the SOC percentage change rate under film mulching was 6.47% higher than that under straw mulching when the mean annual temperature was lower than 10℃. The difference in MBC percentage change rate between different mean annual precipitation amounts reached 27.02%. Crop rotation was conducive to increasing SOC and carbon fractions under straw mulching, but the percentage change rate of SOC under film mulching without crop rotation decreased by 4.52%. There was a significant positive correlation between DOC response ratio and SOC response ratio, but no significant correlation between MBC response ratio and SOC response ratio, and the film mulching time had a significant negative correlation with SOC response ratio. Compared with film mulching, straw mulching was more conducive to increasing SOC and active carbon fractions content under various environmental and management measures.